China’s top tech chiefs are stepping down from their leadership roles amid Beijing’s sweeping crackdown on the sector. E-commerce giant JD.com’s wealthy founder Richard Liu is the most recent executive to step down. Last year, both Zhang Yiming, founder of TikTok-owner ByteDance , and Su Hua, founder of TikTok’s main rival Kuaishou, gave up CEO positions. In 2020, Colin Huang, founder of popular e-commerce platform Pinduoduo, stepped down as CEO. And in 2019, Jack Ma stepped down as chairman of e-commerce behemoth Alibaba. (Alibaba Holdings is also the owner of the South China Morning Post.) The pressure for a regime…